TY  - BOOK
AU  - Ward, Frederick Norville
TI  - Analytical methods used in geochemical exploration by the U.S. Geological Survey
U1  - 622.13 
PY  - 1963///
CY  - Washington
PB  - United States
KW  - PROSPECCION GEOQUIMICA
KW  - GEOLOGIA
KW  - TRABAJO DE CAMPO
ER  -